<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
          <!-- 左侧的滚动视图区域 -->
          <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
            <block v-for="(item, i) in cateList" :key="i">
                <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
            </block>
          </scroll-view>
          <!-- 右侧的滚动视图区域 -->
          <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
            <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
              <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
              <!-- 动态渲染三级分类的列表数据 -->
              <view class="cate-lv3-list">
                <!-- 三级分类 Item 项 -->
                <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                  <!-- 图片 -->
                  <image :src="item3.cat_icon.replace('dev','web')"></image>
                  <!-- 文本 -->
                  <text>{{item3.cat_name}}</text>
                </view>
              </view>
            </view>
          </scroll-view>
        </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        wh: 0,
        cateList: [],
        active: 0,
        cateLevel2: [],
        scrollTop: 0
      };
    },
     onLoad() {
          const sysInfo = uni.getSystemInfoSync()
          this.wh = sysInfo.windowHeight - 50
          this.getCateList()
    },
    methods: {
      async getCateList() {
        const { data: res } = await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i) {
          this.active = i
          this.cateLevel2 = this.cateList[i].children
          this.scrollTop = this.scrollTop === 0 ? 1 : 0
        },
        gotoGoodsList(item3) {
          uni.navigateTo({
            url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
          })
        }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;
  
    .left-scroll-view {
      width: 120px;
  
      .left-scroll-view-item {
        line-height: 60px;
        background-color: #f7f7f7;
        text-align: center;
        font-size: 12px;
  
        // 激活项的样式
        &.active {
          background-color: #ffffff;
          position: relative;
  
          // 渲染激活项左侧的红色指示边线
          &::before {
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
    }
  }
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}

</style>
